Loyal Reader Kate T. has alerted me to a valuable mustache resource. As reported by the indispensable Indicommons, a "Great Mustaches of The LOC" tag has been added to the Library of Congress photostream on Flickr. While most of the images already tagged are not of the Nineteenth Century vintage, there are many fine examples of the styles that survived until after The War To End All Wars.
For example, Dr. John T Gerin's impressive, yet still professional, faceshelf.
A "Good Show" to all involved!